HW7 - ECE 473/TAM 413 Homework Assignment #7 Due: Friday,...

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ECE 473/TAM 413 Homework Assignment #7 Due: Friday, October 24, 2008 1. A pulsating sphere of radius a = 0.15 m radiates spherical waves into air at a frequency of 100 Hz. (a) The intensity at a distance of 0.5 m from the center of the spherical source is 10 W/m 2 . Determine the total acoustic power passing through the surface of a sphere of radius 0.5 m centered on the spherical source. (b) At the surface of the sphere, r = a, compute the intensity and the amplitudes of the acoustic pressure and particle velocity. 2. Consider a simple monopole source radiating into free space (something like a loudspeaker high above a football stadium rather than in a living room). In order to produce sound of frequency 1000 Hz and level SPL = 100 dB at a distance of 15 m, (a) what must be the source strength Q (rms), (b) what must be the intensity and (c) what must be the total acoustic power radiated? Assume it is a nice sunny day at 20˚C. 3. A 0.2-m-radius hemispherical sound source is mounted near to a rigid plane boundary and
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HW7 - ECE 473/TAM 413 Homework Assignment #7 Due: Friday,...

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